Cash-register.



T. GARNBY, DBG'D. 0. I'. DAVIEEDH, ADMINISTRATOR. 0.15151 REGISTER. APPLICATION' FILED A1111311116, 1908.

1 10181486. Patented Feb.27,1912.

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ET-nl Carvziedaf',

T. GARNEIDECD'.

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C211? ou'ma T. CARNEY, vrDEGD. oA P. nAvIssoN, ADMINISTRATUE.

CASH REGISTER.)

wm M 71m u 2s r@ mn ef* m @WWAJ D... rfg om A W m Lm UNITED STATES PATENT OFFICE.

OSCAR F. IDAVISSON.

OF DAYTON, OHIO, ADMINISTRATOR OF THOMAS CABNEY, DE-

CEASED, -ASSIGNOR TO THE NATIONAL CASH REGISTER COMPANY, OF DAYTON, OHIO, .A CORPORATION OF OHIO, (INCORPORATED IN 1906.)

CASH-REGISTER.

Specification of Letters Patent.

Patented Feb. 2.7, 1912.

Original aplication filed December .22, 1902, Serial No. 136,165. Divided and this application fled .Tune

16, 1908. Serial N0. 438.808.

To @ZZ 'whom 'it may concern Be it known that l, Osoaa F. Davisson, a citizen of the United States, residing at Dayton, county ot Montgon'iory, in the State of Ohio, adn'iinistrator (with will annexed) of the estate of THOMAS CArNnr, deceased. late a citizen of the United States, who did in his lifetime invent; certain new and useful Improvements in Cash-Registers, do declare the following to be a full, Clear, and exact deseri ption of said invention.

This invention relates to driving or operating devices and has particular relation to iunnovements in electrically operated machilies.

Among the objects of the invention are to provide electricdrivingv or opera-tuig,T device particularly adapted to operating a cash register or other maohine needing an intermittent operation, although many teaturesbf the invention are equally applicable to other types of driven mechanisms. A eas-h register is operated only intermittently, and at each operation is not in motion for more than a few seconds so that particular attention must be paid to the starting and eontrolling devices for the motor.

A second object therefore, is to provide an improved key control for the motor prevent-img` a second operation before the oompletion of the iii-st, and thereby insuring a complete movement of the registering meehanism. v

Tith these and incidental objects in view, t-he invention consists in certain novel features ot' construction land combinations ot' parts, the essential elements of which are set forth in appended claims and a 'preferred form or' embodiment of which is hereinafter described with reference to the drawings which accompany and form part. ot'. the specification.

Of said drawings: Figure 1 represents a top plan View of the machine embodying my invention,4 with the cabinet removed. Fig. 2 represents an end elevation ot the saine, the cash drawer being omitted. Fig. 3 represents a vertical, transverse section through the machine, on the line 3 2 ot Fig. 1; the cash drawer being omitted. Fig.

'-t represents a detail side elevation ot the key levers and their detent; one ot the said levers beingin a depressed position. Fig. 5 represents a detail side elevation, partly broken away, one of the clerks keys and its look.

The eleetrieI motor used for driving the cash register or other machine is not a part ot the present. invention and has been i'ndicated only diagrammatieally.

The .invention is shown as applied to a woll-known type of cash register now on the marie-et but' it will be evident that its applicability is not limited to rise with this partieular style of maf'hine nor in fact is it limited to' driving Cash registers but may be used with other types ot mechanism. In the register shown banks ot keys are employed .serving to control the movement of levers. A member common to the key levers is employed for drivingr them and the motor is arranged to give this common member a constant excursion at. each operation of the machine. The motor is Connected through a. worm wheel to a cam which serves to give this Constant excursion and the motor eircuit is arranged to be closed by special keys, whereby in addition to the depression of the value key it is necessary to depress some one of the special keys, before the motor will operate. The motor circuit while Closed by the key is nevertheless out of control ot the key after it has been closed so that the operator eannot by a second depression of the key or in any other manner prevent a Complete operatiou of the machine. Near the completion of the operation the movement of the motor breaks its own circuit and restores all the parts to normal position. With this gener-al statement a detailed explanation ot" the operation may be given.

-In the aforesaid drawings, 10 represents the frame of the machine, 11 the register oreounter, 12 the key coupler, 13 the amount keys, 14 the clerks1 keys, 15 the special keys,-

l Ward end of its respective trie motor is suitably connected with this member, and is provided with a st viteh, which .is operated to breek the circuit, by ineens which connect it, with the eoxmnfjri'i operating member. '.lhe clerks keys `which operate the switch, to complete the eu'emt 1e main locked until one ot wthe ernennt keys, or' one oil the special keys is operated l The umoiint l't'eys lll, eoinj'nise suitably nmnhered heads and shenks, which letter :we mounted. in o supporting and guiding plete 13 of the mein freine. lThe key shenke are provided with laterally ,projecting pins" 3' which operate in slots 13" oil" sleeves 1 3, oi'med on the under side of the plete 13a. This slot'iand pin construction prevents the keys fiom turning' in the plete 1 3?.

The key levers 18 are journeled upon ftiensvei'se shaft Bl, so that their forward ends normally p1.' jeet oder the lower ends of the key Shanks, :is :shown in dotted lines in Fig, l, When e key is depressed, the level" e; respondingly depressed, and its ieei" e e vete-d to effect the .couplingr with the pivoted key coupler 12.

Ae e nlnnbe of the perte shown in the present application are substantially the seine in construct-ion, as the parte shown and deseibed in the patent to Ceriiey #i5-83,888, seid .pat-ent iney be referred to toi e more detailed description of seid parts.

".he aforesaid key Coupling bei' l2 joui*- naled in the frame of the machine by teunnions 12a and 12b, and is arranged to eoopei'ete with notches 18 formed in the re speetive key levers, to souple the l-fnfeirss tot" simultaneous operation.. le order, however, th atthe keys may be operated successively, to couple them to the coupling bei', @eeh oi the seme are provided with a pivoted, spi-ing presseff pswl +21. 'Vi' ,n one oi he einer it or speeizii keys is depressed, it impei'ts a slight upward movement to the key coupler. This movement is sulicient to cause the coupletu to passender the lower end of the pawl. 4].- This action prevents the return ofthe lever, independently of the ooupler. After the Coupler has been so raised, the operation of the second key lever will cause its pawl 4l. to engage the key coupler, as seid lever rises, and thus force theI pawl baok- Ward against the tension of its spring, so that, when it passes above the Coupler lzmge 1.2, it will` again spring forward over the seme and become coupled thereto.

The key coupler is limited in its initial movement'by a stop nose 29, formed on a pivoted yoke 32, so as to normally project into the path of a pin 27, carried by an erin 28, integral with the key coupler. This yoke 32 projects under' all of the clerks key levers 18 and is heldin its normal position. by n coiled spfing which connects it 'with the stationery shaft 3l shown Ain dotted line in Fig. Vllfhen one of the clerks key levers is depressed the frame 32 is rocked and the nose 29 is: moved out of the path of' the pin 27, to permit the Coupler' to be op emted.

The lmys of this moelsinv, :is .is usuel in eeh rogisteiqs, ore lividi-ed into ai .Faeries of l'lenks, und eich of these banks is provided 'with one ol. :i series of detent plot (lf3. These pluies ..i'e pivotal] y mounted 'upon a rook shaft ft2, and euch of the sume is held in its noin'iftl gliossltlon by e oeil. spring 4,5, which connects it with the stationery' plete 13a. (See Fig. l). The lower edges of Athe plates lil project into .not-ches 44 formed in the key levers. When. a, key levenis given its initial movement its respective .ten t e3, will be .fwjieked slightly forward, hy the rear vvell olf thi note-li 4&1-, until the level.' posses 4 v treo oi' i i eteofl, lien. the latter 'will ich :il o on, and look kev l position, by passing' as sl'mwn in L the detente fili pifovided, :le y,

for e h benk ot' keys; but e., the special keys moet he operated indep of the 'reptiel' keys, they ere provided mth en independent det-ent, as clearly shim-n in Fig. l. The detente ziie rocked forward, to init the opeieted key levers to .letur'n to their normal po'itions, by :i series ot' pins 75, 'fest on the she't 112, and arranged to engage the Lipper edges of the plates 43, plainly shown in F 4l, The shaftis rocked neel' the end o t' the operation of the machine, by an erin 73 which is fest theieto, and which affed d operated o oem 7e, fast .e tren. rotation shaft 37, This shaft is given one rotation during eeeh. o3 eration o1 the .machine as hereinafter deseifibed, The l. 'ei" T3 is held in its normal Vwith o, pin 'Z7 Fig. 4).

As it is desirable to prevent the opeietion oi any one of the clerks keys until after one oi the amount keys, oi one of the special keys has been operated, eeoh of the clerks key levers .is provided with e stop pin 2 best shown in Fig, 5. These pins are nor Inelly engaged by hook arms 25, mounted on e sleeve 23 fest to :i transverse rock shaft 24. This shaft also carries a series of @ein arms 22, which project upward in proximity to euch of the 'amount keys and special keys. These com arms engage pins 2l, projecting from the amount and special key levers so es to be rocked thereby.

1t Will, be seen from the above that, when one of the amount o1.' special key levers is operated, the 'shaft-24 will be rocked rearward end thi.lsflisenga.ge arms 425, from pins 2G., to release all of the clerks keys.

on the mein frame The iet-ching arms and @ein time :ire 'ren ilo turned to their normal positions by a suitable coil spring 22 which connects one of said arms with the main frame.

Eachof thekey levers 18,-except those of the special keys 15, is formed with a-eam slot 20. These slots of each bank are of graduated formation relative to a bar h of the registering frame 20 W'ithwhich they coperate, as shown in Fig. 3. The pivoted, registering frames 20, carry suitable rack segments and are mounted above the respective key banks. Each of these frames 1s provided with a cross bar 2Ob which when a key lever is operated, is engaged by the walls of the cam slot of said key, and the frame 20, thus rocked to a greater or lessdegree, according to the value of thekey operated. The operating rack segments carried by the registering frames coperate with the pinions of the counter Wheels, to

' impart movement thereto, in a manner Well known in the arti and described in the aforesaid patent. The tablet indicators 16 are mounted to coperate with the rear ends of the key 'levers substantially as described in the said patent. l

The oscillatory movement of the key coupler 12, is converted into rotary movement of the shaft 37 by means of a rack bar 35. This bar is formed with ahorizontal slot 34, int-o which projects a pin 33 Amounted en the arm 28. By this means, the bar 35 is raised and lowered with the'key .ouplexx At its lower end, thebar is forme with a vertical slot .35, through which projects'a guiding and fulcrum pin 85b mpunted on the main frame'. The opposite-edes of tl1e uppe portion of'the bar are ormed with rack teeth which' -are adapted to alternately engage and operate pinions 36 and 38. These pinions are connected, at one side of the rack bar, by an intermediate pinion 40 whereby -the pinion 36 is continuously rotated in the same direction, even though the pinion 38 travelsl in an opposite .direction when rotated. The rack bar is held to its Work by a lug 40'* which plays on one or the other side of a stationary, vertical Harige 40" formed on the main frame. Afspring 39 is connected to the lower end of the plate '35, and is so arranged, that it exerts its tension alternately above and below the pin 35b as the bar is reciprocated. This construction result s in the rack barbeing shifted from one pinion to the other, as the lug 40n passes free of iiange 40h-upon the completion of theA opposite strokes of the rack bar.

The devices above described, are substantially identical with the devices in Letters Patent of the United -States issued to Thomas Carney, July 12, 1904, and num- .link and the arm 50.

After the amount keys land special keys l Athe clerks -keys establishes an electric circuit through the motor 17, lwhich is geared to the key coupler, as hereinafter described.

To accomplish the closing-of the electric circuit, each clerks lkey lever is provided with a pin 46, which engages one of a series of cam arms 48 to rock the shaft 49 upon which the said arms are mounted. Each of the cam arms is formed with a cam edge 47 and a concentric edge 48, whereby, when a key lever is operated, the arm 48 will move only When'the pin 46 is engagin 47. During the time that the pin is passing over the edge 48, the arm 48. remains' stationary for a purpose hereinafter described. The spring 48b Wound about the shaft 49 is connected with'the main frame, and to one of the arms 48 so as to normally hold the arms 48 in the position shown in Fig. 3. The left end of the shaft 49 is pro vided With a crank 50 to which is pivotally connected a pendant link 51 having a cam nose 52 and a notched end 53. The spring 50 is Wound about the pivot of the link 51, and bears with itsl respective ends against the The oiice of this spring is to hold the link 51 against a stationary stop pin 57.l The lower notched end 53 of the link'51 engages a pin 53aL Which connects a pivoted bell crank lever, G8, and a link 55. The link 55 is in its turn`connected with a switch lever 56 which is pivoted to one of the circuit terminals 5Ga of the switch. The-contact terminal 56h of the switch, is of the usual split spring construc tion, and is arranged to receive the contact lever 5G when the latter is depressed, and thus complete the circuit.

When one of the clerks keys is given its initial movement its particular arm 48 is rocked forward and the shaft 49 rocked. This action forces the link 51 downward and a's before described, closes through the motor which operutesthe machine. As the key lever continues its downward movement, the pin 4G, simply plays along the edge48a, of the arm 48 and thus holds' the link 51 depressed, until the key lever is subsequently released, by the rocking of its detent 43. The first downward movement' ot' the link 51 forces the arm 5U the circuit the edge the link 51, the second time, during the same operation of the machine, and also permit-s the necessary sequence of operation.

One of the projecting trunnion ends ofthe key coupler is provided with a crank arm 67 carrying an antifriction roller 66.V This roller is engaged by cam 63,y mountedl upon 4a short rotation shaft 61, which latter is journaled in themain frame, and in an moved out of the path of the lug 65, thus leaving the shaft 61 free to be rotated.

.This same movement of the bell crank brings the roller 71 into the path of the' cam 64 whereby, when the operation is. about half com lcted, with the key cou pler raised, the ever 68 willbe rocked to. draw Ythe contact lever 56 out of connection with the contact 56", and-break 'the' circuit. The momentum of the armature, however, is suicient to carry the parts for- 'ward, after the circuit is'broken, until the lug 65 contacts with the hook 72, when the parts are all arrested. The key coupler. and key levers are returned to normal position by grav-ity orl if desired, .suitable springs l2d may be employed to assist inl the return movement.

, The motor employed in this machine may be of any suitable construction and operation, and, as such construction forms no part of the present invention it isfnot thought necessary to'describe it.

The operation of the machine is asfollows: If a sale of $5.5() is made by clerk A., the amountkeys are first pressed and then the clerks key A. The depression of the amount keys causes their respective key levers to become coupled to the ke c'ouplelj.

When the clerks key is depresse its particular key lever becomes coupled to the key coupler and the circuit is closed by the depression of the contact' lever 56. This operation also releases the machine by moving the hook nose 72 out of the path of the lug 65. The operation of the motor ,then causes the Worm 58 to rotate the Worm wheel 60, and thus elevate the coupler by means of the cam 63 connected to said worm wheel. After the coupler has been' fully elevated, the cam 63 passes free of the roller 66 and thus leaves the coupler free to descend by gravity. At the same time the circuit is broken, but the momentum of the different parts carries the vslform Wheel '60 forward until it arrested 4inits normal position by the lug 6 5 coming into contact with the hook 72.

By means off the peculiar worm sind" .Worm gear connection -it is practicable to employ a' high speed motor and at the same time only operatethe machine with a medium speedamd not fast enough to4 rack or jerk .the arts :during the operation'. By this rapid movement oft-he motor and relatively slow movement of the -in which thefull stroke of the key lever is accomplished by hand, or the keyis set and ,the machine subsequently operated by hand.

It Wilho course be understood that the key levers 18 may be given their initial movements to couple them to the key coupler directly and without the intervention of the keys 13, withoutpdeparting from the spirit of this inventionflt wllalso be understood that suitable printing devices may be coupled to the operating, rack,`segments,` in a manner well understood in the art and embodied in numerous machines, now in use.

It will, of course be understood that any suitable form of cash drawer may be applied to the machine shown, and the latch for said drawer automatically operated dur- 'in the movement'of the key levers.

ilethe form vof mechanism herein shown and described is admirably adapted -to fulfil the objects primarily' stated it is to be understood that it is not intended to confine the invention to the one form of embodiment herein disclosed, for it is sus ceptible of embodiment invarious forms all coming Within the scope'of the claims which follow. j

This application-is a divisionof a prior application Serial' No. 136,165 for cash registers, filed en December 2 2,1902,by Thomas Carney, now deceased. y

What is claimed is as follows:

1. In a machine of the class described', the combination with an .operating mecha nism, of an electric motor for drivin same, a circuity closer or said motor, means or oper-- ating said circuit closer at will,means for destroying the control of said operating means over said circuit closer by its own operation, and Vdevices controlled by said motor and actuated when a complete operation thereof has been given for again giving said operating means controlv of said circuit closer.

-2. In a cash register, the combination with an operating mechanism, of -an electric mo- Itorlconnectedthereto, a circuit closer and ,means Vfor operating the circuitcloser consame, 'a circuit closer for said motor, and' f means ftorbperating said circuit closer, said 4. In' a machine' of the class described,

means having. provisions .for disengaging itself 'from said circuit closer'to allow independent movement of said circuit closer.

the combination with an operating mechanism, ofan'lc'trc motor for driving same,

la circuit "closer for said motor, meansV for operating "said circuit closer, means connectdftoisaidmotoi for withdrawing said circuit""c'lo`s' er from' closing position, and means for 'disconnecting said circuit closer operating K-1ri'e"ai1'. `s'f fjrthe purpose of preventin'g`a-''sebi1dtl` "eration, of the same during an Ile machine( 5. ii. 'machine of. the class described,

' the'coinbinationfvvith an'operating mecha-A liismmidelectlric motor for driving same, a

circuit'closeifmanipulative means for op? erating said' circuit closer and normally engaglng" said closer, and means actuated by the movement ofsaid manipulative means ffdr' brakingsaidengagement.

' 6; Inf'nflmachine `of the class described,4

`the combination vith an operating mechanism, .ofanelectric motor driving same, a

circuit closer for 'said motor, means for operating saidcirciiit closer and normally engagingf-said'closer, means actuated by the movement of said manipulative device for `breaking' said 'n'ormal engagement,l and meansop'erated by Vsaid motor for returningr said circuit closer to its position breaking circuit. l'

7. In .a machine of thev class described, the combination 'with an operating mechamism, of anelectric motor for driving same, a circuit closer', means for operating same, means whereby the actuationof said operating meaiisdisconnects same from the circuit clo'sefiandi'means for returning said circuit-cl'oserto4 its normal posit-ion breaking circuit, and"rre`st ingsaidmotor.

.55 the combination with an operating mecha- 8. I a machine of 'the class described,

nism, 'fand an electric driving device controlling the same, 'of a circuit closer, circuit closer actuating means; and means, compris'in'g'devices operated by the motor to move s aid'eircuit closer to circuit breaking position-,for prevent-ing the continued repetition. 'of operations of the .machine by a continued retention of the circuit closer' opereting means 1n operated position.

9. In a machine of the character described,

nism, and an electric driving .device con-` trolling the saine, of a circuit closer, circuit closer operating means, and means operated by the motor for automatically breaking the circuit to stop the machine at the end of one operation while permitting the circuit closer operating means to remain in operated position.v

10. In a machine of the character described, the combination with an operating mechanism, and an electric driving device-controllingthe same, of a circuit closer, key means. engaging 'said circuit closeri'or operating the closer, and means for automatically disengaging said key means from the circuit closer' afterv the circuit has been closed. A

11. In a machine ofthe character described,

nism, and an electric driving device controlling the same, of a circuit closer, key means engaging said circuit closer. for operating the closer, and means for automatically disengaging said key means from said closed and until the key has been. returned to normal position. l

12. In a machine ofthe character described,v the combination with an operating mechanism, and an electric driving device therefor, of va circuit closer, a key for operating the same to close the circuit, and means for automatically disengaging the. circuit closer to normal broken-circuit position before the key returns.

13. In a machine-0f the character described, the combination with an operating mechanism, and an electric driving device therefor, of a circuit closer, a circuit closer operating means, engaging said circuit closer, means for automatically disengaging said circuit closer operating means after the circuit has been closed., and meansi forarresting the electric driving device at a predeterlnined point,

the combination with an operating mechanism, and an electric driving devicet'herefor, of a circuit closer, circuit. closer operating means, and means connected to the operating mechanism for positively insuring the arresting of the electric driving device.

15. In a machine of the character described, the combination with an operating mechanism,and an electric driving device therefor, of a circuit closer, circuit closer operating means, and means. connected to the operating mechanism for 'simultaneously breaking the circuit and positioning a member for positively arresting the electric-driving device.

16. In a cash register, the combination the combination with an operating mecha-.

les

the combination with an operating mechacircuit closer after the circuit vhas been from the key to permit the former to -return 14. In a machine of the character. described,

with an operating mechanism, and a driving y motor therefor having a constant direction of motion, of a circuit closer for said motor, means for operating the circuit closer7 and means for preventing a second operationl of saidA circuit closer during the operation of the machine, but allowing the return of the circuit closer operating means to normal position.

17. In a cash register, the -coitibination with an operating mechanism, of an electric inotor for driving same, a circuit closer for said motor, means for operating said ycircuit closer, with provisions in the machine for destroying the control by the closer'operating means by movement of said means.

18. In a cash register, the combination with an operating mechanism,'of an electric. drlving devlce for same, a circuit controller for Said motor, means for operating said circuit controller, and means` for destroying the operative control of the operating means over the circuit controller by the movement of the operating means. i

19. In a cash register, the combination withan operating mechanism and an electric driving device for same, ot' means for rendering the device operative, a controllingr device for said means, and-means controlled from the driving device t'or returning `the said i'irstiiieans to normal position irresli'cctive olE the position ol the controllingr means.

till. ln a cash register, Vthecombination ivith an operating mechanism and an electric driving device for same, ot' a circuit. closer for said device, means t'or operating the cir cuit closer, provisions in the machine by virtue of ivhich the ini-vement of the circuit closer operating n -ans destroys its control over the circuit closer, and means for positively openingr said circuit'.

21. ln a cash register, the c o'mbination with an operating mechanism and means normally locking the same, ol an .electric driving device for said mechanism, al circuit closer, means l'or operating same constructed to release the locking means, and provisions in the machine by v irtue of which the move ment of the circuit closer andlock operating means destroys its control over the same.

252. In `a machine of the .-class; described,

the combination with an ope ating -mechanism, of a driving device for same, electrical means for controlling said device, including a circuit closer, means lor operating said closer and normally engaging -said closer. and means actuated with tlnl movement ol' said operating means l'or disengaging thc saine from said circuit closer.

ln a machine of the class tlc.-:ci'ilud` the combination with an operating mechanism, ol a driving device l'or same. elect rical means, including a circuit closer l'or controllingr the movement ol' said devices.

normally engaging said closer, means actuated With said operating means for discon.

necting ,said means from said circuit closer,

-and means operated byv said driving device for returning said circuit closer to normal breaking posit-ion.- v

24. In a machine of the class described, the combination with a driven mechanism, having a constant excursion, of an electric motor for drivincT saine, a circuit closer for said motor, means for operating said closer to start said motor, means operated by said driven mechanism as it returns to normal position for moving said closer to break circuit, and devices preventing a second oper-4 ation of said operating I neans fromoperating said closer until the driven mechanism has vreturned to normal position.

"E25, In a machine of the class described, the combination with a driven mechanism having a constant excursion, of an electric motor '.for driving same, a circuit closer for said motor, manipulative devices for operating said circuit closer, means for destroying the control of said manipulative device over said circuit closer, means operated by said driven mechanism on its return movenient for moving said closer to break circuit, and 'ineai'is for restablislnng the control by .said manipulative device only when the 'driven mechanism returns to normal posi- .lo'tved to .assume its normal uosition.

27. ln a machine oi the class described, thc continuation with an operating mechanism, ot' an'elcctric motor for driving same,

a circuit closet' for said motor, means for operating said circuit closer and for dis- `connecting said circuit closer operating means for the purpose of'preventing a sccond operation of thc same during an operation o'l the machine.

2S. ln a. machine of the class described, the combination with -air operating mechanisnn'ot an electric motor lor driving same, a circuit closer for lsaid motor, means for operating said circuit closer, and means connected with said motor for withdrawing said circuit closet' from closing position, and means itulependent of thc. said operating mechanism for preventingr a second ell'cctive operation-ol' said circuit' closet' operating means `for operating said circuit closer and means during an operation ol' the. machine.

29. In an accounting machine, the com-I bination with an electric driving motor and mechanism driven by said motor, of circuit ciosing means for said motor and means independent of the mechanism driven by the lmotor for preventing a second eective operation of the circuit closing means during a single operation of the machine.

' 30. In an accounting machine, thecombination with an electric driving motorand vmechanism driven thereby, of circuitJ closing means for said motor, circuit opening vmeans operable before the completionof an operation of lthe machine?, and means for preventing a second e'ective operation of 15 the circuit closing means during a. singie operation of the machine.

In testimony whereof I afIiX my signature 'in the presence of two Witnesses.

OSCAR F. DAVISSON, Administrator of the estate of T hama/s Umweg.

Witnesses;

v J. B. HAYWARD, R. C. GLASS. 

